Cause they're fun to watch?
I honestly like to watch those to make fun of them. I find myself laughing at their absurdities.
When I cancelled my tv service in November, there was nothing to do but watch CD movies in the CD player. I had already boxed most of them, so I was buying a few when I saw some in a Dollar store. These were B horror movies. Some so ridiculous that they left you hanging and wondering what happened. All in fun and an excuse to eat popcorn and entertain myself when I hadn't much to do then.